670mm rings a bell for the standard wheel arch height. LSC(lowered sports chassis, Sport/MV6) = a15mm drop and Irmscher = a 30mm drop. Below is a list of pictures covering most variations, (order reversed as I grouped them to one link):
https://photos.app.goo.gl/99oewkFYUCpFkYCq5Dark grey CD estate:
This is how an estate sits on OE front springs and HD rears, (car is a Desmond, but same ride height due to the lighter spring weights, no SL)...
White estate with Irmscher twin spoke 18's and kit:
This is how an estate sits on factory Plod springs with SL (ignore the wheels, they are exactly the same outside diameter as the car in the first picture)...
Black estate with Irmscher Sports Stars and body kit: Standard Elite estate, (with SL, again ignore the wheels as same outside diameter as the first car)...
Black estate, two pics with Irmscher twin spokes and post suspension rebuild:
This is how the estate sits on Irmscher springs, (same wheels as previous and SL deleted)...
Silver saloon with MV6/late Elite wheels:
Standard LSC, (car is a Desmond Sport with 27k miles, so about as close to factory new as you can get)...
Silver saloon:
Standard V6 CDX, (not the best picture, but the difference in ride height should be clear compared to the Sport)...